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Subject[PATCH 02/13] AppArmor: basic auditing infrastructure.
Date
Update lsm_audit for AppArmor specific data, and add the core routines for
AppArmor uses for auditing.

Signed-off-by: John Johansen <john.johansen@canonical.com>
---
include/linux/lsm_audit.h | 27 +++++
security/apparmor/audit.c | 206 +++++++++++++++++++++++++++++++++++++
security/apparmor/include/audit.h | 127 +++++++++++++++++++++++
3 files changed, 360 insertions(+), 0 deletions(-)
create mode 100644 security/apparmor/audit.c
create mode 100644 security/apparmor/include/audit.h
diff --git a/include/linux/lsm_audit.h b/include/linux/lsm_audit.h
index 6907251..13b5c9a 100644
--- a/include/linux/lsm_audit.h
+++ b/include/linux/lsm_audit.h
@@ -94,6 +94,33 @@ struct common_audit_data {
int result;
} selinux_audit_data;
#endif
+#ifdef CONFIG_SECURITY_APPARMOR
+ struct {
+ int error;
+ int op;
+ int type;
+ void *profile;
+ const char *name;
+ const char *info;
+ union {
+ void *target;
+ struct {
+ long pos;
+ void *target;
+ } iface;
+ struct {
+ int rlim;
+ unsigned long max;
+ } rlim;
+ struct {
+ const char *target;
+ u32 request;
+ u32 denied;
+ uid_t ouid;
+ } fs;
+ };
+ } apparmor_audit_data;
+#endif
};
/* these callback will be implemented by a specific LSM */
void (*lsm_pre_audit)(struct audit_buffer *, void *);
diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c
new file mode 100644
index 0000000..12a86c0
--- /dev/null
+++ b/security/apparmor/audit.c
@@ -0,0 +1,206 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor auditing functions
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#include <linux/audit.h>
+#include <linux/socket.h>
+
+#include "include/apparmor.h"
+#include "include/audit.h"
+#include "include/policy.h"
+
+const char *op_table[] = {
+ "null",
+
+ "sysctl",
+ "capable",
+
+ "unlink",
+ "mkdir",
+ "rmdir",
+ "mknod",
+ "truncate",
+ "link",
+ "symlink",
+ "rename_src",
+ "rename_dest",
+ "chmod",
+ "chown",
+ "getattr",
+ "open",
+
+ "file_perm",
+ "file_lock",
+ "file_mmap",
+ "file_mprotect",
+
+ "create",
+ "post_create",
+ "bind",
+ "connect",
+ "listen",
+ "accept",
+ "sendmsg",
+ "recvmsg",
+ "getsockname",
+ "getpeername",
+ "getsockopt",
+ "setsockopt",
+ "socket_shutdown",
+
+ "ptrace",
+
+ "exec",
+ "change_hat",
+ "change_profile",
+ "change_onexec",
+
+ "setprocattr",
+ "setrlimit",
+
+ "profile_replace",
+ "profile_load",
+ "profile_remove"
+};
+
+const char *audit_mode_names[] = {
+ "normal",
+ "quiet_denied",
+ "quiet",
+ "noquiet",
+ "all"
+};
+
+static char *aa_audit_type[] = {
+ "APPARMOR_AUDIT",
+ "APPARMOR_ALLOWED",
+ "APPARMOR_DENIED",
+ "APPARMOR_HINT",
+ "APPARMOR_STATUS",
+ "APPARMOR_ERROR",
+ "APPARMOR_KILLED"
+};
+
+/*
+ * Currently AppArmor auditing is fed straight into the audit framework.
+ *
+ * TODO:
+ * convert to LSM audit
+ * netlink interface for complain mode
+ * user auditing, - send user auditing to netlink interface
+ * system control of whether user audit messages go to system log
+ */
+
+/**
+ * audit_base - core AppArmor function.
+ * @ab: audit buffer to fill
+ * @sa: audit structure containing data to audit
+ *
+ * Record common AppArmor audit data from @sa
+ */
+static void audit_pre(struct audit_buffer *ab, void *ca)
+{
+ struct common_audit_data *sa = ca;
+ struct task_struct *tsk = sa->tsk ? sa->tsk : current;
+
+ if (aa_g_audit_header) {
+ audit_log_format(ab, " type=");
+ audit_log_string(ab, aa_audit_type[sa->aad.type]);
+ }
+
+ if (sa->aad.op) {
+ audit_log_format(ab, " operation=");
+ audit_log_string(ab, op_table[sa->aad.op]);
+ }
+
+ if (sa->aad.info) {
+ audit_log_format(ab, " info=");
+ audit_log_string(ab, sa->aad.info);
+ if (sa->aad.error)
+ audit_log_format(ab, " error=%d", sa->aad.error);
+ }
+
+ audit_log_format(ab, " pid=%d", tsk->pid);
+
+ if (sa->aad.profile) {
+ struct aa_profile *profile = sa->aad.profile;
+ pid_t pid;
+ rcu_read_lock();
+ pid = tsk->real_parent->pid;
+ rcu_read_unlock();
+ audit_log_format(ab, " parent=%d", pid);
+ audit_log_format(ab, " profile=");
+ if (profile->ns != root_ns) {
+ audit_log_format(ab, ":");
+ audit_log_untrustedstring(ab, profile->ns->base.hname);
+ audit_log_format(ab, "://");
+ }
+ audit_log_untrustedstring(ab, profile->base.hname);
+ }
+
+ if (sa->aad.name) {
+ audit_log_format(ab, " name=");
+ audit_log_untrustedstring(ab, sa->aad.name);
+ }
+}
+
+/**
+ * aa_audit - Log an audit event to the audit subsystem
+ * @type: audit type for the message
+ * @profile: profile to check against
+ * @gfp: allocation flags to use
+ * @sa: audit event
+ * @cb: optional callback fn for type specific fields
+ *
+ * Handle default message switching based off of audit mode flags
+ *
+ * Returns: error on failure
+ */
+int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
+ struct common_audit_data *sa,
+ void (*cb) (struct audit_buffer *, void *))
+{
+ if (type == AUDIT_APPARMOR_AUTO) {
+ if (likely(!sa->aad.error)) {
+ if (AUDIT_MODE(profile) != AUDIT_ALL)
+ return 0;
+ type = AUDIT_APPARMOR_AUDIT;
+ } else if (COMPLAIN_MODE(profile))
+ type = AUDIT_APPARMOR_ALLOWED;
+ else
+ type = AUDIT_APPARMOR_DENIED;
+ }
+ if (AUDIT_MODE(profile) == AUDIT_QUIET ||
+ (type == AUDIT_APPARMOR_DENIED &&
+ AUDIT_MODE(profile) == AUDIT_QUIET))
+ return sa->aad.error;
+
+ if (profile && DO_KILL(profile) && type == AUDIT_APPARMOR_DENIED)
+ type = AUDIT_APPARMOR_KILL;
+ sa->aad.type = type;
+
+ if (profile && !unconfined(profile))
+ sa->aad.profile = profile;
+
+ sa->lsm_pre_audit = audit_pre;
+ sa->lsm_post_audit = cb;
+ common_lsm_audit(sa);
+
+ if (sa->aad.type == AUDIT_APPARMOR_KILL)
+ (void)send_sig_info(SIGKILL, NULL, sa->tsk ? sa->tsk : current);
+
+ if (sa->aad.type == AUDIT_APPARMOR_ALLOWED)
+ return complain_error(sa->aad.error);
+
+ return sa->aad.error;
+}
diff --git a/security/apparmor/include/audit.h b/security/apparmor/include/audit.h
new file mode 100644
index 0000000..24cdfe8
--- /dev/null
+++ b/security/apparmor/include/audit.h
@@ -0,0 +1,127 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor auditing function definitions.
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#ifndef __AA_AUDIT_H
+#define __AA_AUDIT_H
+
+#include <linux/audit.h>
+#include <linux/fs.h>
+#include <linux/lsm_audit.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+#include "file.h"
+
+struct aa_profile;
+
+extern const char *audit_mode_names[];
+#define AUDIT_MAX_INDEX 5
+
+#define AUDIT_APPARMOR_AUTO 0 /* auto choose audit message type */
+
+enum audit_mode {
+ AUDIT_NORMAL, /* follow normal auditing of accesses */
+ AUDIT_QUIET_DENIED, /* quiet all denied access messages */
+ AUDIT_QUIET, /* quiet all messages */
+ AUDIT_NOQUIET, /* do not quiet audit messages */
+ AUDIT_ALL /* audit all accesses */
+};
+
+enum audit_type {
+ AUDIT_APPARMOR_AUDIT,
+ AUDIT_APPARMOR_ALLOWED,
+ AUDIT_APPARMOR_DENIED,
+ AUDIT_APPARMOR_HINT,
+ AUDIT_APPARMOR_STATUS,
+ AUDIT_APPARMOR_ERROR,
+ AUDIT_APPARMOR_KILL
+};
+
+extern const char *op_table[];
+enum aa_ops {
+ OP_NULL,
+
+ OP_SYSCTL,
+ OP_CAPABLE,
+
+ OP_UNLINK,
+ OP_MKDIR,
+ OP_RMDIR,
+ OP_MKNOD,
+ OP_TRUNC,
+ OP_LINK,
+ OP_SYMLINK,
+ OP_RENAME_SRC,
+ OP_RENAME_DEST,
+ OP_CHMOD,
+ OP_CHOWN,
+ OP_GETATTR,
+ OP_OPEN,
+
+ OP_FPERM,
+ OP_FLOCK,
+ OP_FMMAP,
+ OP_FMPROT,
+
+ OP_CREATE,
+ OP_POST_CREATE,
+ OP_BIND,
+ OP_CONNECT,
+ OP_LISTEN,
+ OP_ACCEPT,
+ OP_SENDMSG,
+ OP_RECVMSG,
+ OP_GETSOCKNAME,
+ OP_GETPEERNAME,
+ OP_GETSOCKOPT,
+ OP_SETSOCKOPT,
+ OP_SOCK_SHUTDOWN,
+
+ OP_PTRACE,
+
+ OP_EXEC,
+ OP_CHANGE_HAT,
+ OP_CHANGE_PROFILE,
+ OP_CHANGE_ONEXEC,
+
+ OP_SETPROCATTR,
+ OP_SETRLIMIT,
+
+ OP_PROF_REPL,
+ OP_PROF_LOAD,
+ OP_PROF_RM,
+};
+
+
+/* define a short hand for apparmor_audit_data portion of common_audit_data */
+#define aad apparmor_audit_data
+
+int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
+ struct common_audit_data *sa,
+ void (*cb) (struct audit_buffer *, void *));
+
+static inline int complain_error(int error)
+{
+ if (error == -EPERM || error == -EACCES)
+ return 0;
+ return error;
+}
+
+#define COMMON_AUDIT_DATA_INIT_NONE(_d) \
+ do { \
+ memset((_d), 0, sizeof(struct common_audit_data)); \
+ (_d)->type = LSM_AUDIT_DATA_NONE; \
+ } while (0)
+
+#endif /* __AA_AUDIT_H */
--
1.7.0.4


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